Muffler



C. N. WOOD Sept. 28, 1943.

MUFFLER Filed Sept. 18, 1941 000 o o o o o o 0 000,00

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INVENTOR C OLINTON NOT/v4 wooo BY: @2316) v ATTORN EY Patented Sept. 28, 1943 MUFFLER Colinton Notman Wood; Victoria, British Columbia, Canada Application September 18, 1941, Serial No. 411,390 In Canada August 12, 1941 8 Claims.

This invention relates to a muiiler for internal combustion engines.

An object of the present invention is the provision of an exhaust muffler in which there is practically no back pressure.

Another object is the provision of an exhaust muffler in which the exhaust noises are reduced to a minimum.

Another object is the provision of an exhaust mufiler designed considerably to reduce vibration.

A further object is the provision of a device of the nature described of very simple and durable construction.

With these and other objects in view, the present invention consists essentially of a muffler for internal combustion engines, comprising a casing, inlet and outlet openings at opposite ends of the casing, said inlet opening being adapted to be connected to the exhaust pipe of an engine, a plurality of opposed pairs of zones mounted in the casing, the bases of said cones being secured to the wall of the casing, and a plurality of apertures formed in the cones, the apertures of one cone being staggered in relation to the apertures of the next cone, whereby a tortuous passage is formed through the casing from the inlet to the outlet thereof, as more fully described in the following specification and illustrated in the accompanying drawing, in which Figure 1 is an elevation of the muiiler, Figure 2 is a longitudinal section through the muilier, taken on the line 22 of Figure 4,

its outer end, extends outwardly from the inletl3 and another short pipe H. having flange I8 on its outer end extends outwardly from the outlet I4. The inlet I3 is adapted to be connected to the exhaust pipe of an internal combustion engine (not shown) while the outlet M may discharge into the air or it may be connected to an exhaust or tail pipe (not shown).

A plurality of opposed pairs of hollow cones 20 and 2| are mounted in the casing in, the bases 20a and 2 la of the respective walls of these cones being secured to the wall of the casing in any suitable manner, such as by welding. The bases a and 21a of the cones of each pair may be spaced apart any desired distance, or, as preferred, they may be brought together, as shown in the drawings, and welded together and to the casingwall. Each cone 20 has a plurality of apertures 22 located adjacent its base 20a while each cone 2| has a plurality of apertures 23 adjacent its apex, so that the apertures of said cones are staggered in relation to each other.

Starting at the inlet end of the casing, the first pair of cones 2|] and 2| are arranged so that the cone 20 is concentric with and spaced from the conical wall H to form an expanding passage 24 which diverges from the inlet |3 to the wall of the casing at the apertures 22 of the cone 20.

The area between the cones 20 and 2| forms an expansion chamber 25.

The apex 26 of the cone 20 of the next pair of opposed cones is located adjacent the cone 2| of the first pair and in fact, it preferably projects into the latter cone, as shown. The cones 2| and 20 of the first and second pairs of cones form an annular expansion chamber 21 which is substantially V-shaped in cross section.

The third and fourth pairs of cones are mounted in the same manner as the first and second pairs, and the cone 2| of the last pair is mounted concentric with and spaced from the conical wall l2 to form a conical area 28. The apertures 23 of the last cone 2| open into the area 28 adjacent the outlet l4.

- In larger mufiiers, the casing I0 is provided with one or more sight openings 38 each covered by an inspection door 3| removably secured to the casing by a plurality of bolts 32, there being .a gasket 33 inserted between the door and the casing. v I

A tortuous passage is formed in the casing by the passage 24, the apertures 22 and 23, the expansion chambers 25 and 21, and the area 23,

said passage extending from the inlet I3 to the outlet It.

In use, the exhaust gases from the engine enter the casing l0 through the inlet opening I3. These gases immediately and naturally expand in the expanding passage 24 towards the apertures 22 of the cone 20, and wall II of the cone 2?] also directing the gases in the desired direction. Cn passing through the latter apertures, the gases expand towards the relatively large center of the chamber 7.5 and towards the apertures 23. The inner surface of the cone 2| assists 'in directing the gases towards the center of the expansion chamber. The gases then pass through the apertures 23 of the cone 2| into the annular expansion chamber 27 where they again naturally expand towards the apertures 22 of the next cone 2!, the shape of the chamber also assisting this movement.

This process is repeated until the gases pass through the apertures 23 of the last cone 2| into the area 28, which directs the gases to the outlet M. The total area of the apertures 22 and 23 in their respective cones is sufficient to allow the free passage of the gases.

With this arrangement, the exhaust gases follow a tortuous passage through the casing it. and yet they always move in a natural direction, that is, in the direction in which they are expanding. Consequently, there is practically no back pressure and the usual vibration is reduced considerably. The noise of the engine is dampthe end wall of said opening, and a plurality of apertures formed in the cones, the apertures of one cone being staggered in relation to the apertures of the next cone, whereby a tortuous passage is formed through the casing from the inlet to the outlet thereof.

4. A muilier for internal combustion engines, comprising a casing, inlet and outlet openings at opposite ends of the casing, said inlet opening being adapted to be connected to the exhaust pipe of an engine, a plurality of opposed pairs 'of hollow cones mounted in the casing, the bases of. the walls of each pair of cones being secured ened to a very great extent in the gas-filled tortuous passage.

The cones 29 and El brace the casing lll internally and the joining or welding of the bases of these cones together and to the casing wall makes it doubly strong. In the larger models, the inspection doors 36 may be removed from time to time to permit the inspection and cleaning, if necessary, of the cones and the interior of the casing.

Various modifications may be made in this invention without departing from the spirit thereof or the scope of the claims, and therefore, the exact forms shown are to be taken as illustrative only and not in a limiting sense, and it is desired that only such limitations shall be placed thereon as are disclosed in the prior art or are set forth in the accompanying claims.

What I claim as my invention is:

l. A mufiler for internal combustion engines,

comprising a casing, inlet and outlet openings at opposite ends of thecasingsaid inlet opening being adapted to be connected to the exhaust pipe of an engine, a plurality of opposed pairs of hollow cones mounted in the casing, the bases of the walls of said cones being secured to the wall of the casing, and a plurality of apertures formed in the cones, the apertures of one cone being staggered in relation to the apertures of the next cone, whereby a tortuous passage is formed through the casing from the inlet to the" outlet thereof.

2. A muffler for internal combustion engines, comprising a casing, inlet and outlet openings at opposite ends of the casing, said inlet opening being adapted to be connected to the exhaust pipe or" an engine, a plurality of opposed pairs of hollow cones mounted in the casing, the bases of the walls of said cones being secured to the wall of the casing, and a plurality of apertures formed in the cones, the apertures of some cones being located adjacent the bases of their walls and the apertures of each alternate cone adjacent its apex, whereby a tortuous passage is opening being-concentric with and spaced from together and to the Wall of the casing and the cone adjacent the inlet opening being concentric with and spaced from the end wall of said opening, and a plurality of apertures formed in the cones, the apertures of some cones being located adjacent the bases of their walls and the apertures of each alternate cone adjacent its apex, whereby a tortuous passage is formed through the casing from the inlet to the outlet thereof.

5. A mullier for internal combustion engines, comprising a casinginlet and outlet openings at opposite ends-of the-casing, said inlet opening being adapted to be connected to the exhaust pipe of an engine, a plurality of opposed pairs of hollow cones mounted in the casing, the bases of the walls of each pair of cones being adjacent each other and. secured to the wall of the casing, I,

being adapted to be connected to the exhaust.

pipe of an engine, a plurality of opposed pairs of hollow cones mounted in the casing, the basescf the walls of eachpair of cones being secured together and to the wall of the casing and the apex of the first cone of each succeeding pair is located adjacent the secondcone of the preceding pair, an expansion chamber within each pair of cones, an annular expansion chamber between adjacent pairs of cones, each annular chamber being substantially V-shaped in cross section, and a plurality of apertures formed inthe cones, the apertures of one cone being staggered in relation to the apertures of the next cone, whereby a tortuous passage is formed through the casing from the inlet to the outlet thereof.

7. A muffler for internal combustion engines, comprising a casing, conical end walls projecting outwardly from the opposite ends of the casing, inlet and outlet openings formed in the opposite end walls centrally thereof, said inlet opening being adapted to be connected to: the exhaust pipe of an engine, a plurality of opposed pairs of hollow cones mounted in the casing, thebases of the walls of said cones being secured to the Wall of the casing and the cone adjacent the inlet opening being concentric with andspaced from the end wall of said opening, a plurality of apertures formed in the first cone of each pair adja cent the base of the wall thereof, and a plurality of apertures formed in the second cone of each pair adjacent its apex, whereby a tortuous passage is formed through'the casing from the inlet to the outlet thereof. I

8. A muffler for internal combustion engines, comprising a casing, inlet and outlet openings at opposite ends of the casing, said inlet openings being adapted to be connected to the exhaust pipe of an engine, a plurality of opposed pairs of hollow cones mounted in the casing, the bases of the walls of each pair of cones being secured together and to the wall of the casing, and the apex of the first cone of each succeeding pair is located adjacent the second cone of the preceding pair, an expansion chamber within each pair of cones, an annular expansion chamber between adjacent pairs of cones, each annular chamber being substantially V-shaped in cross section, a plurality of apertures formed in the first cone of each pair adjacent the base of the Wall thereof, and a plurality of apertures formed in the second cone of each pair adjacent its apex, whereby a tortuous passage is formed through the casing from the inlet to the outlet thereof.

COLINTON NOTMAN WOOD 

